This idea has been around for a while but I thought I might throw my recommendation into the mix, as I feel Firefox is one of the only browsers yet to implement such feature. When I say workspaces I mean the ability to switch between "tab bars". For example, one tab bar (workspace) may contain websites about job searching; the tab bar contains tab groups, pinned tabs and the like. Another tab bar (workspace) contains websites about house searching; and also contains tab groups, pinned tabs and so on. There can be a little icon in the top left corner that when clicked shows you a drop-down menu where you can switch between workstations. By persistent I mean that you can save these workstations like bookmarks (maybe you have the choice between having your workspace be temporary or not). But unlike bookmarks they are able to open all your previous tabs, tab groups, pinned tabs, etc instantly. The best we have right now is saving all the tabs in a dedicated bookmark folder and right clicking to open all bookmarks, then redoing all the tab groups and pinned tabs; then to switch you have the close all the tabs and open another folder and repeat the same thing.
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